On Fri, Jan 10, 2014 at 03:07:29PM -0700, Bill Sumner wrote:
> +context_get_entry(struct context_entry *context_addr,
> + struct intel_iommu *iommu, u32 bus, int devfn)
> +{
> + unsigned long long q; /* quadword scratch */
> + struct root_entry *root_phys; /* Phys adr (root table entry) */
> + struct root_entry root_temp; /* Local copy of root_entry */
> + struct context_entry *context_phys; /* Phys adr */
> +
> + if (pr_dbg.domain_get)
> + pr_debug("ENTER %s B:D:F=%2.2x:%2.2x:%1.1x &context_entry:0x%llx &intel_iommu:0x%llx\n",
> + __func__, bus, devfn>>3, devfn&7,
> + (u64)context_addr, (u64)iommu);
> +
> + if (bus > 255) /* Sanity check */
> + return -5;
> + if (devfn > 255 || devfn < 0) /* Sanity check */
> + return -6;
> +
> + q = readq(iommu->reg + DMAR_RTADDR_REG);
> + pr_debug("IOMMU %d: DMAR_RTADDR_REG:0x%16.16llx\n", iommu->seq_id, q);
> + if (!q)
> + return -1;
> +
> + root_phys = (struct root_entry *) q; /* Adr(base of vector) */
> + root_phys += bus; /* Adr(entry we want) */
> +
> + oldcopy(&root_temp, root_phys, sizeof(root_temp));
> +
> + pr_debug("root_temp.val:0x%llx .rsvd1:0x%llx root_phys:0x%llx\n",
> + root_temp.val, root_temp.rsvd1, (u64)root_phys);
> +
> + if (!root_present(&root_temp))
> + return -2;
> +
> + pr_debug("B:D:F=%2.2x:%2.2x:%1.1x root_temp.val: %llx .rsvd1: %llx\n",
> + bus, devfn >> 3, devfn & 7, root_temp.val, root_temp.rsvd1);
> +
> + if (root_temp.rsvd1) /* If (root_entry is bad) */
> + return -3;
> +
> + context_phys = get_context_phys_from_root(&root_temp);
> + if (!context_phys)
> + return -4;
What do all these magic return values mean?
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